navette

[na-vet; French na-vet] /næˈvɛt; French naˈvɛt/
noun, plural navettes
[na-vets; French na-vet] /næˈvɛts; French naˈvɛt/ (Show IPA).
Jewelry.
1.
a gem, usually not a diamond, cut as a marquise.
Origin
1905-10; < French: weaver's shuttle; literally, little ship. See nave, -ette